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All Journal Bulletin of Scientific Contribution : Geology Journal of Geoscience, Engineering, Environment, and Technology Journal of Geosciences and Applied Geology
Iskandarsyah, Teuku Yan Waliana Muda
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Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Energy Engineering Environmental Science Physics

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Geo-Environment Aspects Assessment Applied In Land Stability Determination Of A Disaster-Prone Area: A Case Study Around The Lembang Active Fault Zone, On The Western Part Of Bandung Basin, Indonesia Iskandarsyah, Teuku Yan Waliana Muda; Brilian, Ciria Humanis; Trisnadiansyah, Mochamad Ridfan; Listiawan, Yudhi; Barkah, M. Nursiyam; Sulaksana, Nana; Hendarmawan, Hendarmawan
Journal of Geoscience, Engineering, Environment, and Technology Vol. 9 No. 3 (2024): JGEET Vol 09 No 03 : September (2024)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2024.9.3.18062

Abstract

Rainfall, landforms, lithology or soil characteristics, and geological structures are geo-environment aspects that might be used to assess stability of the land in a disaster-prone area, e.g. in a case of study around the Lembang active fault zone of the western part of Bandung Basin, Indonesia. In this study, such geo-environment aspects were weighted and scored constantly in five class of value and importance, due to its influence on the land stability. After this scoring method applied, firstly, a land capability of the research area in relation to disaster potential will be recognized and used to analyze its land stability. According to such analyses, the study area can be divided into two zones of land stability, i.e. (i) moderate area which dominates the research area, and (ii) non-stable or unstable area near Lembang active fault zone. The dominant moderate and unstable area show that the fault zone has still widely affected the surroundings landscape and its physical characteristics. In fact, the current evaluation of existing landuse show that the development has been carried out intensively on these areas. It indicates that the development of the area is contituted as a high risk activity. Therefore, in this case, a good spatial planning or an environmental good governance must be applied appropriately in such disaster-prone area.
Rock Characteristics as The Basis of Aquifer Determination In Cianjur Sub-Watershed, Cugenang District, Cianjur Regency, West Java Province Husaeni, Ahmad; Listiawan, Yudhi; Fachrudin, Kurnia Arfiansyah; Iskandarsyah, Teuku Yan Waliana Muda
Journal of Geological Sciences and Applied Geology Vol 5, No 1 (2021): Journal of Geological Science and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v5i1.34872

Abstract

Based on Presidential Decree Number 12 of 2012, this research area is part of the Upstream Citarum watershed and part of the Citarum River Basin. The boundary of this research area is the Cianjur Sub-watershed which has an area of approximately 41.0 km2. The research area is the eastern part of Mount Gede. This study aimed to determine the characteristics of the lithology as the basis of aquifer determination that composed the research area based on the results of surface geological mapping and supported by petrographic analysis. This research used a method split into several stages, namely the stages of fieldwork, rock sampling, and laboratory analysis. At the fieldwork stage, geological mapping of the surface was carried out by observing rock outcrops in the research area. At the sampling stage, it is done by taking rock samples representing each rock unit in the research area. As for the last stage, laboratory analysis is performed using the petrographic analysis method, namely the analysis of thin sections on rock samples to observe each of the mineral contained and porosity characteristics in the rock samples. The results of the thin section analysis are then compared with the existing classifications. Based on the results of the analysis, the research area is composed of igneous rocks, volcanic rocks, and pyroclastic rocks which are divided into three (3) units, namely the Volcanic Breccia Unit (SBv), Volcanic Tuff Unit (STv), and Volcanic Lava Unit (SLv). Based on these three units of lithology, SBv which is a unit of volcanic breccia is an aquifer
Geological Hazard Potential Using Scoring And Weighting Method In Citeureup Sub-watershed, Citeureup District And Surrounding Area, Bogor Regency Adji, Andika Rhadiya Putra; Iskandarsyah, Teuku Yan Waliana Muda; Listiawan, Yudhi
Journal of Geological Sciences and Applied Geology Vol 8, No 1 (2024): Journal of Geological sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v8i1.57037

Abstract

Geological hazards are hazard caused by geological processes. Citeureup Sub-watershed, located in Bogor Regency, is a densely populated area threaten by geological hazards. The purpose of this study is to determine the distribution of geological hazards using scoring and weighting method. Factors that analyzed to determine hazards potential including: slope, rocks physical property, lineament density, and rainfall. Hazard potential in study area divided into five different levels, ranging from very low to very high, with geological hazards in the form of mass movement and earthquake. Main factor of mass movement hazard potential is slope, meanwhile earthquake potential hazard main factor is lineament density, which indicates geological structure. Rocks physical property and rainfall are supporting factors that can increase geological hazards potential.
Groundwater Characteristics Analysis to Identify the Seawater Intrusion in Coastal Deep Aquifer System, Semarang, Central Java, Indonesia Listiawan, Yudhi; Virgianty, Aisyah Shafa; Pramudyo, Tulus; Iskandarsyah, Teuku Yan Waliana Muda
Journal of Geoscience, Engineering, Environment, and Technology Vol. 9 No. 04 (2024): JGEET Vol 09 No 04 : December (2024)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2024.9.04.18561

Abstract

The study area is located in Semarang, representing a coastal and industrial zone where groundwater exploited as main water resources. Seawater instrusion has been identified as a significant issue in coastal regions due to its impact on groundwater quality. The study was conducted using groundwater data from deep aquifers (bore wells). The physical and chemical contents were analyzed to determine the groundwater characteristics and identify the seawater intrusion. Piper and Durov diagram were used to determine the hydrochemical facies and the main processes that influence the chemical content in groundwater. The Cl vs Na/Cl ratio diagram were used to identify the source of Cl and Na ions, determining weather the ions originate from anthropogenic activites or seawater intrusion. The Physical properties of groundwater show that the groundwater in the study area is divided into 2 group: a freshwater group with TDS value <1000 mg/L and a brackish water group with TDS value ranging from 1000 – 4006 mg/L. The results of hydrochemical analysis indicates the occurrence of seawater intrusion in some locations. Seawater intrusion in the study area mainly occurs in the northern part of Semarang city which relatively near with coastal line. The seawater intrusion also occurs in the eastern part of study area (Demak) with a more severe level, reaching areas at a further distance from coastal line compared to Semarang city.
GEOLOGY OF CIBEUREUM AND SURROUNDING AREAS, CIBEUREUM DISTRICT, KUNINGAN REGENCY, WEST JAVA PROVINCE Ahmadjayadi, Tigfhar; Pratiwi, Santi Dwi; Iskandarsyah, Teuku Yan Waliana Muda
Bulletin of Scientific Contribution Vol 21, No 1 (2023): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v21i1.46128

Abstract

This study compiled a comprehensive geological map of Cibeureum and its surrounding areas in Cibeureum District, Kuningan Regency, West Java, using primary data and systematic geological methods, including field observations, data sampling, and laboratory analysis. Geographically, the area is located at 108o 42' 33.75"–108o 45' 16.8" East Longitude and 7o 02' 10.31"–7o 04' 52.20" South Latitude. The main purpose of this study is to identify the geological characteristics and phenomena that might have occurred in the past as well as in the future. In this study, geomorphological analysis was carried out, based on morphography, morphometry, and morphogenetic interpretations; stratigraphic analysis, based on interpretation of rock units, ages, and depositional environments; and analysis of geological structures, based on interpretation of DEM data and field observations. The results showed that the study area consists of very fine-coarse sandstones with carbonate and non-carbonate properties, claystone, and tuff. The geomorphological units are divided into four, namely Volcanic Stepping Hills, Structural Stepping Hills, Denudational Plains, and Denudational Slightly Steep Low Hills. Geological structures found in the field are folds, faults and joints. Based on the distribution of lithology, reconstruction of strike-dip patterns, and biostratigraphy analysis, the depositional of informal lithostratigraphy units in the study area began in the Middle Miocene and continued into the Quartenary, starts from Sandstone Units (Tmpbp) in N10 to N21, Claystone Unit (Tmpbl) in N12 to N21, Interbedded Claystone and Sandstone Unit (Tmpblbp) in N16 to N19, and continued with the deposition of Tuff Unit (Qt).
Co-Authors Adji, Andika Rhadiya Putra Ahmadjayadi, Tigfhar Brilian, Ciria Humanis Fachrudin, Kurnia Arfiansyah Hendarmawan Hendarmawan, Hendarmawan M. Nursiyam Barkah, M. Nursiyam Nana Sulaksana Pramudyo, Tulus Trisnadiansyah, Mochamad Ridfan Uus Ahmad Husaeni Virgianty, Aisyah Shafa Yudhi Listiawan